Motor-operated saw



May 10,1927.

M. CLODFELTER IOTOR OPERATED SAW Filed April 9" 1925 s sheets-sheet 1 Patented May 10, 1927.

MAYO CLODFELTER, OF DETROIT, MICHIGAN.

' MOTOR-OPERATED SAW.

Application filed April 9, 1925. Serial No. 21,837.

The present invention relates to a portable motor operated saw, and aims to provide a novel and improved device of this character which may be conveniently clamped to material to be sawed thereby for efficiently supporting the device in an op erative position.

Another object of the invention is the provision of a motor operated saw which may be supported in either a horizontal or vertlcal position, said device having spring means for applying a pressure to the saw blade for holding the same in contact with the material to be sawed. v I

A further object of the invention is to provide means for breaking the circuit to the motor for stopping the same after the material has been out, said means for breaking the circuit also serving the purpose of supporting the saw blade against further downward movement after the sawing of the material, said device being so constructed that either a wood or metal saw may be used in connection therewith.

A still further object of the invention is the provision of a supporting member carrying a motor driven sprocket gear and an adjustable sprocket gear over which a chain travels, said chain having connection with 30 a slidable cross head that carries the saw blade for reciprocating said saw blade in order to cut material, the stroke of said saw blade being governed by the length of the chain and the distance the cross head is permitted to slide.

It is also an object of the invention to provide a motor operated saw of the kind indicated, which is simple and substantial in construction, which can be manufactured economically, and which will be thoroughly oilicient and practical in use.

With the foregoing and other objects in view, which will be apparent as the description proceeds, the invention resides in the construction and arrangement of parts, as hereinafter described and claimed, it being understood that changes can be made within the scope of what is claimed without departing from the spirit of the invention.

The invention isillustrated in the accom-v panying drawings, wherein:

Figure 1 is a side elevation of my improved device, showing the same clamped to material to be sawed thereby,

Figure 2 is also a side elevation, showing the opposite side thereof,

Figure 3 is a cross secti 33 of Figure 1 Figure 1- is a fragmentary cross section Figure 5 is a f tion on line 5-'5 taken on line 4l of Figure 1,

on taken on line ragmentary horizontal sec- Figure 1,

Figure 6 is a detail section taken on line 66 of Figure 3, Figure 7 is a section showing breaker,

fragmentary longitudinal the, circuit maker and Figure 8 is a detail elevation of the mov-.

able

Figure 9 is a sec? ion showing my device when sawing metal,

member of the circuit" maker and breaker,

fragmentary longitudinal the manner of supporting and is an elevation of a metal saw the manner of connecting the same device.

In carrying out the invention the numeral 15 designates an elongated body having a pair of uprights rigidly carried thereby,

one being arranged at one end and designated by the numeral 16, while the other is arranged at the hated by the by the uprights spaced parallel bars supporting a ore and bars; .18 and of the elongated body 1 numeral 17.

opposite end and desig- Rigidly carried 16 and 17 are a pair of '18 and 19, for slidably head 20 through which 19 extend. Upon one end is mounted an electric motor 21 having a small driving pinion 22 mounted on the drive shaft thereof for n'iesl'iing with a larger gear or pinion 23 arranged upon one also mounted up as indicated by At the end of end of a rotatable shaft 24 on said body in bearings,

the numerals 25 and 26.

the body 15 where the upright 17 is arranged is provided an offset bracket 27 which ports a shaft 28.

receives and rotatably sup- Mounted on theshaft 28 adjacent the bracket 2? is a worm gear 29 that meshes with a worm 30 carried bv the opposite end of the rotatable shaft 24 from that carrying the gear 23, for rotating said shaft 28." Also mounted on the a large sprocket shaft 28 is gear 31 which has a con tinuous chain 32 arranged thereabout for travelling thereover, while spaced from the gear 31 is a small also travels about.

bracket 3% adj body lockin g screws er gear 33 which said chain The gear 33 is carried ustably connected to the 15 by the provision of a pin 35 upon which said bracket may turn and a pa r of 36 which are threaded fit) fit)

t ll

through said bracket and abut against the sides of the body '15. By the provision of this adjustable feature the chain may be held tight by simply turning said bracket on its pivot. "he chain 32 has one link thereof provided with a hug; li which is iiivotally connected by a. pin 38 to one end ot a crank arm St), the opposite end oil which is attached to a cross pin 40 extending through the cross head 20. From the foregoing, it is obvious that the turning of the chain will cause the cross head 20 to be reciprocated on the bars 18 and 19.

Detachably connected to the body 15, as at $1, is a clamping member 42 which is arranged for engaging the material to be sawed, such material. being indicated by the numeral 43. The clamping member consists of a stationary jaw 44 having a series of small prongs 4L5 arranged on the face thereot for engaging into the material 4:3 and an adjustable jaw l6 having a like face tor engaging the material. The adjustable jaw 46 has pivotally connected thereto a. lever t7 carrving a pawl 48 which is adapted to engage in teeth t?) provided upon the portion 50 ot the clamp on which the adjustable jaw to is slidably supported. it will be noted that the pivot ot the lever 1? and the pivot ot the pawl to said lever are arraiu 'ed so that .aid lever may be swam: to a position in order to hold said pawl between the desired teeth ll) in the portion oi the clamp.

J irrai'iged on the u nfight 1? above the detachable connection 41 of? the bod with the clamp 42 is provided an eye 51. that nuiy be connected at the point; ll. to the clamp in order to support the body 15 in a vertical plane. the detail com-'truction oi the onnect'ion being ot any wel known tvpc l'or rigidly attaching the body to the clamp.

Upon the end ot the pin a l-ll oppo:-;ito to that wl ere the crank arm is attaclnzd is mounted an arm tor turning movement,

'lhe arm extends downwardly in an inclined direction and has the lower end thereof provided with a slot 54: tor receiving: the upper edge. of one end of a saw blade said saw blade being socured to said arm by passing a pair of screws 56 or the like through said arm and saw blade. Positioned on the shaft 40 on the opposite sides of the arm 52 are a pair of collars 5? that are secured to said pin l0 by passing small pins 58 through the collars and pin 40. In each of the collars 57 are provided small openings 59 into which engage the opposite ends of a spring member (50, as at 61, the intermediate portion of said spring member 60 engaging over the arm 52, as at 62, in order to transmit a downward pressure on the arm 59 for holding the saw blade 55 in engagement or contact with the material to be cut. l-lv lower end ot the arm when the saw blade is moved downwardly to a position where the same has completely out the material to be sawed. Upon the upper end of the arm (53 is rigidly carried an lm-sha 'ied extension or lever 66 which has the portion (3? thereo't extending; between the bars 1? and it) at the rear end of the slidable head 20. The head 20 has an opening or en all bore (38 therein, a. illustrated in Figure 5; ol? the drawinp'. which receives one end ot a sheably mounted pin (Ell carried by the llill'll'lll' 16 when the cross head is at its ercreme rearward stroke. It will he noted that the arm 6?; is moved dmvnwardly hr the inc. (35 on the arm cu aggingg' therewith that the portion 7 of ie l -shaped extension ('36 moves in a position to prevent thc pin (it) being; received in the bore (335 at. the 22-;- treme rearward stroke thus causing the slidable pin (it) to be moved 'carwardly through the upright 16.

Arranged in the upright 16 between the ends of the bars 18 and 19 are a pair of electric contacts 70 and which norn'ially engage a tapered taco T2 provided on the pin (59 tor ':ompletin an electric circuit to the motor 2t. However, when the pin (35) 's slid rcarwardiy by contacting with the men'iber the circuit to the motor is brol-ien, as the pin is constructml o'l insulation mater'al with the execution oi the tapered portion which has been moved out of engagement with the spring;- contacts 70 and Tl, thus stopping; the 111010; which will. cam-2e the operation oil? the device to cease alter the sa ot the material l3 completed.

In Figures 9 and it (it illust'ated the form 0 my invention used for sa'iving metal. In this term a different type of elan'iping member is attached to the body 15, which cons ts ot t bench clamp '73 and vice structure pl, said beneh clamp being adapted to be secured to any member for supporting the device, while the vice structure supports tl c metal to be sawed, as indicated by the numeral. 75. In this form the saw blade 55 is disconnected from the arm 52 and a hack saw 76 having a rearwardly extending portion 77 is attached to the arm 52 in place thereof.

In operation of the term of my invention the drawings is All ltlt) ll l 7 back and forward on the bars 18 and 19, which will cause a reciprocating motion to be imparted to the saw blade 55, the

spring serving the purpose of holding the blade 55 in contact with the material to be cut. After the material has been entirely cut the saw blade 55 is permitted to move in a downward direction until the same engages the adjustable screw 64 carried by the arm 63, which will swing the arm 63 to aposition to move the L-shaped member 66 in alignment with the slidably mounted pin (59, thus causing said pin to be'moved rear- \vardly when the saw blade moves to its next rearward stroke, which will break the circuit to the motor, thus bringing the device to a stop. The arm 63 is frictionally carried by the pin 40 so that the same will remain in the same position until engaged by the arm 52. I

The operation of the form of my invention shown in Figures 9 and 10 is identical with the other form with the exception that the device is not supported by the material to be out, said material being received in the vice structure 74.

Having thus described my invention, what I claim as new is:

1. A motor opera-ted saw comprising a body, a motor carried by said body, a cross head slidably mounted on said body, means connecting said cross head to said motor for reciprocating said cross head upon operation of the motor, a shaft extending from one side of said cross head, a saw bladepivotally carried by said shaft, an electric switch carried by said body and in circuit with said electric motor, and an arm pivotally carried by said shaft and adapted to be engaged by said saw blade after the same has cmnpleted its cuttl'ormoving a portion of said arm to a position to engage said electric switch for breaking the circuit to said motor.

2. A motor operated saw comprising a body, a motor carried by said body, a cross head slidably mounted upon said body, means connecting said cross head to said motor for reciprocating said cross head upon operation of said motor, a shaft carried by said cross head, an arm pivotally connected to said shaft, a saw blade carried by said arm, spring means engaging said arm for normally urging said saw blade in a downward direction in engagement with the material to be sawed, another arm carried by said shaft and adapted to be engaged by said first mentioned arm for swinging the same on said shaft, an electric switch carried by said body and in circuit with said motor, and means carried bysaid second mentioned arm adapted to be arranged in a position for engagingsaid electric switch when said arm has been moved by the first mentioned arm carrying said saw electric switch to motor.

3. A motor operated saw comprising a body, a crosshead slidably mounted upon said body, a motor carried by said body, means connecting said cross head to said motor for reciprocating said crosshead upon the operation of the motor, an arm pivotally connected to said crosshead, a saw blade carried by said arm, another arm pivotally carried by said crosshead, and adjusting screw carried by said second mentioned arm and adapted to lie in the path of movement of said first mentioned arm so that said second mentioned arm will be moved by said first mentioned arm, an extension arranged upon said second mentioned arm, an electric switch carried by said body and adapted to be engaged by the extension onsaid second mentioned arm when said second mentioned arm has been moved by said first mentioned blade for operating said break the circuitto the arm and the crosshead moved towards saidswitch, said switch being connected to said electric motor for breaking the circuit thereto. In testimony whereof, I have aflixed my signature.

MAYO CLODFELTER. 

